【作者】 陈刚；

【导师】 李丽娟；

【作者基本信息】 湖南大学 ， 计算机应用技术， 2008， 硕士

【摘要】 近年来,计算机通信技术的发展和Internet的普及,使数字信息和产品的传播更加方便和广泛,但与此同时,软件版权保护也成为人们亟待解决的问题。软件水印作为一门新兴的软件版权保护技术,可以用来标识作者、发行者、所有者、使用者等,并携带有版权保护信息和身份认证信息,可以鉴别出非法复制和盗用的软件产品。PE文件格式是微软公司32位视窗操作系统下的主流文件格式之一,所有的Win32执行体都以此格式存储于磁盘上。以往对PE文件的研究工作大多集中于反病毒领域,基于PE文件的软件水印的研究还处于起步阶段。为此,本文主要做了如下几个方面的工作:(1)在详细分析PE文件格式的基础上,对PE文件中的冗余进行了深入的研究,并提出了一种基于指令替换的软件水印算法,通过替换PE文件中原有指令并将其移入构造代码段,使水印与原有指令的结合更紧密,提高了水印的隐蔽性和抗攻击能力。(2)通过对PE文件中引入表的深入研究,提出了基于PE文件引入表的软件水印算法,利用PE文件引入表结构中的冗余字段嵌入水印,并根据嵌入字段特点对嵌入信息进行伪装,提高了水印的隐蔽性。(3)对PE文件中引入表结构进行了深入研究,提出了基于重构PE文件引入表结构的软件水印算法,通过对引入表结构的重构将水印嵌入载体PE文件,不需要在载体文件中添加额外数据,具有较强的隐蔽性和鲁棒性。(4)针对单个PE载体文件中嵌入信息量较小的问题,提出了基于引入表的多文件软件水印算法,通过追溯引入表生成多文件之间的联系树,将水印分散存储于多个文件中,提高了信息嵌入量,同时具有较好的隐蔽性和抗攻击能力。本文对以上四种算法分别实现了算法系统,验证了其可行性和有效性。更多还原

【Abstract】 In recent years, with the development of computer communication technology and the popularization of the Internet, the dissemination of digital information and products has become more convenient and widespread. At the same time, software copyright protection has become issues requiring urgent solution. As a new technology of software copyright protection, software watermarking can be used to identify its author, publisher, owner, user, etc. Besides, it carries information of copyright protection and identification, thus it can identify those illegally copied or embezzled software products.PE file format is one of the mainstream file formats of Microsoft’s Windows operating system. All executants of Win32 are stored on the disk in this format. Research work about PE file is mostly concentrated in the area of anti-virus, while research of software watermark is still in the initial stage. On this account, the following actions have been taken in this thesis.(1) On the basis of detailed analysis of PE file format, it further studies the redundancy of PE file and proposes an algorithm of software watermark, which is based on the replacement of instructions. By replacing the original instruction in the PE file and moving it into the section of structure code, this algorithm combines more closely the watermark with the original instruction and improves the watermark’s imperceptibility and invulnerability.(2) Through the intensive study of the import table in PE file, based on which it proposes an algorithm and embeds the watermark taking advantage of the miscellaneous character in the import table in PE file. Moreover, it disguises the embedded information in accordance with the characteristics of the embedded characters, which improves the watermark’s imperceptibility.(3) It also studies the structure of the import table in PE files, based on which it proposes another software watermark algorithm. This algorithm embeds the watermark into the carrier PE file, through the reform of the import table’s structure. There’s no need to add any extra data. The algorithm has good imperceptibility and invulnerability.(4) Referring to the matter of limited embedded information in each single carrier, algorithm of multi-file software watermark based on the import table is proposed. Through tracking back to the relation trees within the multiple files generated by the import table, and by storing the watermark distributed in multiple files, this algorithm increases the capacity of embedded information and has good imperceptibility and invulnerability.In this thesis, the above four algorithms have been shapes of algorithm system, each of which has been verified its feasibility and effectiveness.更多还原